It's drunk hot from a cup, not eaten with a spoon, even though it's made from the same fermented grain flour as a thick porridge.
Uji is a smooth, pourable porridge made from millet, sorghum, or maize flour, traditionally left to ferment slightly for a gentle sour tang. Street vendors ladle it into enamel cups from big flasks at roadside stalls across Kenya, usually served alongside mandazi.